Bosch Appliances 3122 475 22015en manual Setting the radiator delay switches

INTEGRUS Installation and User Instructions System description and planning en 9

1.5Setting the radiator delay switches

As described in section 1.3.6, differences in the delays of the signals picked up by the receiver from two or more radiators can cause black spots as a result of the multi path effect.

The signals picked up by the receiver are delayed by:

•the transmission from transmitter to radiator through the cable (cable signal delay)

•the transmission from radiator to receiver through the air (radiation signal delay)

•for systems with two or more transmitters: the transmission through the slave transmitter(s)

To compensate the signal delay differences, the delay of each radiator can be increased. These signal delays can be set with the delay switches at the back of the radiator.

The cable signal delays can be determined in the fol- lowing two ways:

•by measuring the cable lengths

•by measuring the impulse response time with a delay measurement tool

In both cases the cable signal delays can be calculated manually and with the delay switch calculation tool (available on the documentation CD-ROM).

It is not necessary to calculate the cable signal delay in case:

•the radiators are directly connected to the transmit- ter with equal cable length;

•radiators are loop-through connected, but with less than 5 m distance between the first and last radiator in a trunk, and with equal cable length between the first radiator in each trunk and the transmitter.

In these cases set the delay switches on all radiators to zero and determine whether to compensate for radia- tion signal delay (see section 1.5.3).

The next sections describe how to calculate the delay switch positions manually for systems with one trans- mitter, or two or more transmitters. See the delay switch calculation tool for the procedures how to calcu- late the delay switch positions automatically.

Tip: The delay switch calculation tool eases

the calculation of the delay switch positions.

1.5.1 System with one transmitter

1.5.1.1Determining delay switch positions by measuring the cable lengths

Use the following procedure to determine the delay switch position based on cable lengths:

1.Look up the cable signal delay per meter of the used cable. The manufacturer specifies this factor.

2.Measure the lengths of the cables between the transmitter and each radiator.

3.Multiply the lengths of the cables between the transmitter and each radiator with the cable signal delay per meter. These are the cable signal delays for each radiator.

4.Determine the maximum signal delay.

5.Calculate for each radiator the signal delay differ- ence with the maximum signal delay.

6.Divide the signal delay difference by 33. The rounded off figure is the signal delay switch posi- tion for that radiator.

7.Add delay switch positions for radiators under a balcony, if applicable (see section 1.5.3).

8.Set the delay switches to the calculated switch posi- tions.

Caution: Turn the delay switches carefully to a new position until you feel that it clicks into position, to prevent that a switch is positioned between two num- bers, which would result in a wrong delay setting.

Bosch Security Systems 2005-04 3122 475 22015en